Add "GHS" talk at the Gerrit User Summit 2023

Publish Fabio Ponciroli's talk, including slides and YouTube video,
presenting what GHS is and its development status.

Change-Id: I73b3495781cb2656539a41af822e4bc18195d13c
diff --git a/pages/site/community/presentations.md b/pages/site/community/presentations.md
index 79df959..11ad209 100644
--- a/pages/site/community/presentations.md
+++ b/pages/site/community/presentations.md
@@ -229,6 +229,8 @@
 
 ## Tools / ThirdParty
 
+* [Git Health Service](https://docs.google.com/presentation/d/1aIdRQzRGDujPvSXmjhMYysoDY8B6wYeAoZbC-oWHhZY) (2023)
+  * [Video](https://youtu.be/0_UD33aK-3o)
 * [Using GitHub Actions with GerritHub](https://storage.googleapis.com/gerrit-talks/summit/2021/2021-12-01%20Using%20GitHub%20Actions%20with%20GerritHub.pdf) (2021)
 * [Overview of Gerrit in AWS](https://storage.googleapis.com/gerrit-talks/summit/2021/Overview%20of%20Gerrit%20in%20AWS-03-12-2021.pdf) (2021)
 * [Forward Gerrit events to Jenkins via AWS Kinesis](https://storage.googleapis.com/gerrit-talks/summit/2021/Virtual%20Gerrit%20Summit%202021_%20Forward%20Gerrit%20events%20to%20Jenkins%20via%20AWS%20Kinesis.pdf) (2021)